Bagaimana untuk Menyimpan Bukti Kelayakan Pengguna dengan Selamat dalam Perisian?

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

public class SecureCredentials {

    private static final char[] PASSWORD = "YourEncryptionKey".toCharArray();
    private static final byte[] SALT = {
        (byte) 0xde, (byte) 0x33, (byte) 0x10, (byte) 0x12,
        (byte) 0xde, (byte) 0x33, (byte) 0x10, (byte) 0x12
    };

    public static void encrypt(char[] property) throws Exception {
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD));
        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
        pbeCipher.init(Cipher.ENCRYPT_MODE, key, new PBEParameterSpec(SALT, 20));

        // Encrypt and save to temporary storage
        String encrypted = Base64.encodeBytes(pbeCipher.doFinal(property));

        // Cleanup data sources
        for (int i = 0; i < property.length; i++) {
            property[i] = 0;
        }
        property = null;
        System.gc();

        // Return encryption result
        return encrypted;
    }

    public static String decrypt(String property) throws Exception {
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD));
        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
        pbeCipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
        return new String(pbeCipher.doFinal(Base64.decode(property)));
    }

    // Usage example
    public static void main(String[] args) {
        try {
            char[] password = "MySecurePassword".toCharArray();
            String encryptedPassword = encrypt(password);
            String decryptedPassword = decrypt(encryptedPassword);

            System.out.println("Original Password: " + String.valueOf(password));
            System.out.println("Encrypted Password: " + encryptedPassword);
            System.out.println("Decrypted Password: " + decryptedPassword);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}